+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S E M _ I N T R --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- Processing for intrinsic subprogram declarations
-
-with Atree; use Atree;
-with Einfo; use Einfo;
-with Errout; use Errout;
-with Fname; use Fname;
-with Lib; use Lib;
-with Namet; use Namet;
-with Sem_Eval; use Sem_Eval;
-with Sem_Util; use Sem_Util;
-with Sinfo; use Sinfo;
-with Snames; use Snames;
-with Stand; use Stand;
-with Stringt; use Stringt;
-with Targparm; use Targparm;
-with Uintp; use Uintp;
-
-package body Sem_Intr is
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Check_Exception_Function (E : Entity_Id; N : Node_Id);
- -- Check use of intrinsic Exception_Message, Exception_Info or
- -- Exception_Name, as used in the DEC compatible Current_Exceptions
- -- package. In each case we must have a parameterless function that
- -- returns type String.
-
- procedure Check_Intrinsic_Operator (E : Entity_Id; N : Node_Id);
- -- Check that operator is one of the binary arithmetic operators, and
- -- that the types involved have the same size.
-
- procedure Check_Shift (E : Entity_Id; N : Node_Id);
- -- Check intrinsic shift subprogram, the two arguments are the same
- -- as for Check_Intrinsic_Subprogram (i.e. the entity of the subprogram
- -- declaration, and the node for the pragma argument, used for messages)
-
- procedure Errint (Msg : String; S : Node_Id; N : Node_Id);
- -- Post error message for bad intrinsic, the message itself is posted
- -- on the appropriate spec node and another message is placed on the
- -- pragma itself, referring to the spec. S is the node in the spec on
- -- which the message is to be placed, and N is the pragma argument node.
-
- ------------------------------
- -- Check_Exception_Function --
- ------------------------------
-
- procedure Check_Exception_Function (E : Entity_Id; N : Node_Id) is
- begin
- if Ekind (E) /= E_Function
- and then Ekind (E) /= E_Generic_Function
- then
- Errint
- ("intrinsic exception subprogram must be a function", E, N);
-
- elsif Present (First_Formal (E)) then
- Errint
- ("intrinsic exception subprogram may not have parameters",
- E, First_Formal (E));
- return;
-
- elsif Etype (E) /= Standard_String then
- Errint
- ("return type of exception subprogram must be String", E, N);
- return;
- end if;
- end Check_Exception_Function;
-
- --------------------------
- -- Check_Intrinsic_Call --
- --------------------------
-
- procedure Check_Intrinsic_Call (N : Node_Id) is
- Nam : constant Entity_Id := Entity (Name (N));
- Cnam : constant Name_Id := Chars (Nam);
- Arg1 : constant Node_Id := First_Actual (N);
-
- begin
- -- For Import_xxx calls, argument must be static string
-
- if Cnam = Name_Import_Address
- or else
- Cnam = Name_Import_Largest_Value
- or else
- Cnam = Name_Import_Value
- then
- if Etype (Arg1) = Any_Type
- or else Raises_Constraint_Error (Arg1)
- then
- null;
-
- elsif not Is_Static_Expression (Arg1) then
- Error_Msg_NE
- ("call to & requires static string argument", N, Nam);
-
- elsif String_Length (Strval (Expr_Value_S (Arg1))) = 0 then
- Error_Msg_NE
- ("call to & does not permit null string", N, Nam);
-
- elsif OpenVMS_On_Target
- and then String_Length (Strval (Expr_Value_S (Arg1))) > 31
- then
- Error_Msg_NE
- ("argument in call to & must be 31 characters or less", N, Nam);
- end if;
-
- -- For now, no other special checks are required
-
- else
- return;
- end if;
- end Check_Intrinsic_Call;
-
- ------------------------------
- -- Check_Intrinsic_Operator --
- ------------------------------
-
- procedure Check_Intrinsic_Operator (E : Entity_Id; N : Node_Id) is
- Nam : Name_Id := Chars (E);
- T1 : Entity_Id;
- T2 : Entity_Id;
- Ret : constant Entity_Id := Etype (E);
-
- begin
- if Nam = Name_Op_Add
- or else Nam = Name_Op_Subtract
- or else Nam = Name_Op_Multiply
- or else Nam = Name_Op_Divide
- then
- T1 := Etype (First_Formal (E));
-
- if No (Next_Formal (First_Formal (E))) then
-
- -- previous error in declaration.
- return;
-
- else
- T2 := Etype (Next_Formal (First_Formal (E)));
- end if;
-
- if Root_Type (T1) /= Root_Type (T2)
- or else Root_Type (T1) /= Root_Type (Ret)
- then
- Errint (
- "types of intrinsic operator must have the same size", E, N);
-
- elsif not Is_Numeric_Type (T1) then
- Errint (
- " intrinsic operator can only apply to numeric types", E, N);
- end if;
-
- else
- Errint ("incorrect context for ""Intrinsic"" convention", E, N);
- end if;
- end Check_Intrinsic_Operator;
-
- --------------------------------
- -- Check_Intrinsic_Subprogram --
- --------------------------------
-
- procedure Check_Intrinsic_Subprogram (E : Entity_Id; N : Node_Id) is
- Spec : constant Node_Id := Specification (Unit_Declaration_Node (E));
- Nam : Name_Id;
-
- begin
- if Present (Spec)
- and then Present (Generic_Parent (Spec))
- then
- Nam := Chars (Generic_Parent (Spec));
- else
- Nam := Chars (E);
- end if;
-
- -- Check name is valid intrinsic name
-
- Get_Name_String (Nam);
-
- if Name_Buffer (1) /= 'O'
- and then Nam /= Name_Asm
- and then Nam not in First_Intrinsic_Name .. Last_Intrinsic_Name
- then
- Errint ("unrecognized intrinsic subprogram", E, N);
-
- -- We always allow intrinsic specifications in language defined units
- -- and in expanded code. We assume that the GNAT implemetors know what
- -- they are doing, and do not write or generate junk use of intrinsic!
-
- elsif not Comes_From_Source (E)
- or else not Comes_From_Source (N)
- or else Is_Predefined_File_Name
- (Unit_File_Name (Get_Source_Unit (N)))
- then
- null;
-
- -- Shift cases. We allow user specification of intrinsic shift
- -- operators for any numeric types.
-
- elsif
- Nam = Name_Rotate_Left
- or else
- Nam = Name_Rotate_Right
- or else
- Nam = Name_Shift_Left
- or else
- Nam = Name_Shift_Right
- or else
- Nam = Name_Shift_Right_Arithmetic
- then
- Check_Shift (E, N);
-
- elsif
- Nam = Name_Exception_Information
- or else
- Nam = Name_Exception_Message
- or else
- Nam = Name_Exception_Name
- then
- Check_Exception_Function (E, N);
-
- elsif Nkind (E) = N_Defining_Operator_Symbol then
- Check_Intrinsic_Operator (E, N);
-
- elsif Nam = Name_File
- or else Nam = Name_Line
- or else Nam = Name_Source_Location
- or else Nam = Name_Enclosing_Entity
- then
- null;
-
- -- For now, no other intrinsic subprograms are recognized in user code
-
- else
- Errint ("incorrect context for ""Intrinsic"" convention", E, N);
- end if;
- end Check_Intrinsic_Subprogram;
-
- -----------------
- -- Check_Shift --
- -----------------
-
- procedure Check_Shift (E : Entity_Id; N : Node_Id) is
- Arg1 : Node_Id;
- Arg2 : Node_Id;
- Size : Nat;
- Typ1 : Entity_Id;
- Typ2 : Entity_Id;
- Ptyp1 : Node_Id;
- Ptyp2 : Node_Id;
-
- begin
- if Ekind (E) /= E_Function
- and then Ekind (E) /= E_Generic_Function
- then
- Errint ("intrinsic shift subprogram must be a function", E, N);
- return;
- end if;
-
- Arg1 := First_Formal (E);
-
- if Present (Arg1) then
- Arg2 := Next_Formal (Arg1);
- else
- Arg2 := Empty;
- end if;
-
- if Arg1 = Empty or else Arg2 = Empty then
- Errint ("intrinsic shift function must have two arguments", E, N);
- return;
- end if;
-
- Typ1 := Etype (Arg1);
- Typ2 := Etype (Arg2);
-
- Ptyp1 := Parameter_Type (Parent (Arg1));
- Ptyp2 := Parameter_Type (Parent (Arg2));
-
- if not Is_Integer_Type (Typ1) then
- Errint ("first argument to shift must be integer type", Ptyp1, N);
- return;
- end if;
-
- if Typ2 /= Standard_Natural then
- Errint ("second argument to shift must be type Natural", Ptyp2, N);
- return;
- end if;
-
- Size := UI_To_Int (Esize (Typ1));
-
- if Size /= 8
- and then Size /= 16
- and then Size /= 32
- and then Size /= 64
- then
- Errint
- ("first argument for shift must have size 8, 16, 32 or 64",
- Ptyp1, N);
- return;
-
- elsif Is_Modular_Integer_Type (Typ1)
- and then Non_Binary_Modulus (Typ1)
- then
- Errint
- ("shifts not allowed for non-binary modular types",
- Ptyp1, N);
-
- elsif Etype (Arg1) /= Etype (E) then
- Errint
- ("first argument of shift must match return type", Ptyp1, N);
- return;
- end if;
- end Check_Shift;
-
- ------------
- -- Errint --
- ------------
-
- procedure Errint (Msg : String; S : Node_Id; N : Node_Id) is
- begin
- Error_Msg_N (Msg, S);
- Error_Msg_N ("incorrect intrinsic subprogram, see spec", N);
- end Errint;
-
-end Sem_Intr;
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